Norton 66252938878 Surface Grinding Wheel 46 Grit 7in

Product Description

The NORTON 66252938878 is a Type 1 straight surface grinding wheel engineered for precision stock removal on ferrous metals. Built around an aluminum oxide abrasive bonded in a vitrified matrix, the wheel carries a 46 grit coarse grade with a J hardness code, placing it in the medium hardness range for balanced cut rate and wheel life. It measures 7 inches in diameter, 0.5 inches thick, with a 1-1/4 inch arbor hole, and is rated to a maximum of 3,600 RPM. The specification designation 32AA46-JVTR identifies the exact formulation. This wheel is installed and dressed by machinists and tool room operators working with surface grinders and cylindrical grinders in production and tool-and-die environments.

This grinding wheel is suited for use on hard carbon steels, soft carbon steels, and tool steels. It is designed for operation on surface grinders, cylindrical grinders, and CNC cutting tool machines. The porous, vitrified bond structure promotes coolant flow and chip clearance, making the wheel well-suited for precision flat surface work where heat control and consistent finish are priorities. The blue wheel color is consistent with the NORTON 32A Series Type 1 product line.

Key Features

• Aluminum oxide abrasive for effective grinding of carbon and tool steels
• Vitrified bond provides rigidity, porosity, and thermal stability during grinding
• 46 grit coarse grade for aggressive stock removal
• J hardness code in the medium hardness range for balanced wheel wear
• Porous structure supports coolant penetration and swarf evacuation
• Type 1 straight wheel profile with no recess, no taper — direct arbor mount

Compatibility

Rated for use with surface grinders, cylindrical grinders, and CNC cutting tool machines. Suitable for grinding hard carbon steels, soft carbon steels, and tool steels per the manufacturer material application data.

Installation Notes

Installation should be performed by a qualified machinist or grinder operator following ANSI B7.1 safety standards for the use, care, and protection of abrasive wheels. Always inspect the wheel for cracks or chips before mounting — perform a ring test by tapping the wheel gently and listening for a clear tone. Mount the wheel with proper blotters and flanges, ensure the machine spindle RPM does not exceed the 3,600 RPM rating stamped on the wheel, and run the wheel under guard for at least one minute before bringing it into contact with the workpiece.